Remote-control apparatus



Nov. 1s, 1930. p. P. STOKR 1,781,963

REMOTE CONTROL APPARATUS original Filed Feb. 19, 1929 INVENTOR: P. P. Stok er',

Patented Nov. 1 8, 1930Y UNITED ImranIA OFFICE PAUL r. sToKEn, or WILKINSB'URG, IanNNsYnvANIA, AssIGNon; ro THEUNION SWITCH a SIGNAL` coMPANy, or swIssvALE, PENNSYLVANIA, A conroRA'rIoN vor PENNf SYLVANIA 'l amore-CONTROL APPARATS Application` nica February 1e, Y192e, serial Nq. 341,067. Renewed Aprilils, 1930.

My invention relatesto remote-control api paratus, and is particularly suitable for,

though not limited to,the coded current control of railway traiflc governing devices,such as signals, from a distant polnt. v

One feature of my invention is the provi.- i slon of means for-avoidingthe transmission of coded current for theicontrol of a stop in.- dication of a signal when a track relay-.whichr enters into the control of the signal has been deenergized;

' I willdescribe one form of apparatus embodying my invention, and will then point;

,out the novel features thereof .in claims.

The accompanying drawing is a'diagrammatic view, showing one form of apparatus embodying my invention. f

Referring to the drawing,`the reference ycharacters 1 andV la designate the track rails of a stretch Y of railway track'connecte'd with a siding Z by means of aswitch-F; The switch F may Vbe controlled by any suitable means forming kno part of kpresent invention,

Y only,v and whenv reversed, directs -traic overs-tretcliY to orfrom siding Z. A circuit controller operated by switchlF `comprises contacts 42 and 7 2, which, while switch Efis in its normal position connect with'terminals 4.52.a and 7 2a, respectively, and when switchFv is reversed, connect with terminals 4212 and 72b, respectively. Y

A section A-B of stretch Y is insulated from the adjoining portions of stretch Y andv of siding Z by means of joints 2. Section' A-B is provided with' a track circuity which is supplied with current by a battery' 3 con-` nected across the rails adjacent olie end of the section, and which includes.' a relay G6 connected across the railsadjacent the"opposite'l endV of the section. Relay G controls a slow releasing relay D. K. f

Signal arms ,designated bythe reference characters S1, S1S.3 Vand S4, and wh-ich, Vas hereshown, lare ofthe semaphore type, govern the movenientof traflic intoI section A--B'.

Arms. S1 andiSinountedfona common mast? adjacent location A, govern eastbound moves,

the drawing, vover switch F Vnormal or re-'f versed, respectively. Arms Sai and S4, adjacentloca-tion B,govern westbound moves over K Signal arms S1 and S2 are controlled by a l .relay H1, and armsS3 and S-1r are controlled.= byV a relay H2, the ,selection between the larms rvcontrolled byfeachiof these. relays being effected bythe position of the'swit'ch-operatedf contacts 42 and'72,respectively. lRelays H1 V switch Fnormal or reversed, respectively. v

and H2 `areprovided with'pick-.up circuits. i

which are controlled by selectors Vdesignated by the reference` characters .J1` and J2, respectively. Stickcircuits forr relays H1 and thewindin'gs. of relays H1 andH2.y 'l I i Each of the selectors G5. .H2 are controlled by. relay G. A'thir'd selector J 3 at times causes the de-energization of Y relays H1 and H2 vby formiriga' shunt path. around the windingsof these relays'. A `re V sistanceV unit 82 prevents short-circuiting .of battery Q2 when selector J3 forms a'shunt*l path Varound J1, Jzand J3 is pro'- Vvided with a contact 9 which is closedwhen and only when its selector isv energized by coded currentV to which thesel'ector is `responsive." Operation of selectors J1, J2, and .f

J 3 is efectedby coded currents supplied' over conductorsfl and 22 as controlledby a lever V-'which maybe placed with.` other similar levers in a suitable locationr such, forex'amf ple, as a trai-n despatchers oflice.

Lever V- has a normal position N and two reverse positions L and R rwhich are in'oppoy site directions from position N. rFwo contactVr devices,M1 and M2, are operated by lever V. A

Each oithese contact- Ydevices comprises a tube' 10, constructed of an electrically insulating'material'and containinga quantity of an electrically conducting substance 1p1, lwhich ,may, for-example, be a Vliquid such as mer! cury.

Vith lever VA in its normal' :position N,

as-v shown, the tubes l() aretilted in one diA rection so that the liquid conductor -11 o'ccupies one end only of each. tube. VVh-en Veither of the tubes is tilted i'ntogsuch a posif tion that the end occupied by the. liquid is higher than the` opposite end, the liquid passes to the opposite end through a small orifice 8, such a transfer of the liquid troni one end to the other of either tube consuming Terminals 13, 1a, 17, Ll5 anddo, which are setin the wall of tube oit' device M2, are

like-wise insulated from each other YwhenY lever V is in its N position. Q

, Upon the operation of lever V to position L, the end ot tube 10 of device lV 1, occupied by the liquid is raised above the opposite end of the tube, and henceliquid 11 is so shifted fan..

that it serves as a conducting medium ibe-L tween terminal 59 and terminals (tlaud G2 until the liquid passes through oriiicefSL" il pon the subsequenti'eturn oi lever V' to' position N,;liquid 11 similarly serves, for a brief period of time, as a conducting medium Y between terminals and-76. `Duringthe 'f operation oflever Vv from position N :to

- position L and its subsequent return to posi-1 tion N, the end of tube 101 of device ii/12pclower than the opposite end, and hence no' connectionis made from voneterimnal to an-' other of device M2. f 4 i terminal 13 to terminalslel and 17. YWhen lever V is: returned trom position Rito Iposition N, liquid 11 in device M2 forms afcon? ducting medium between terniinals and fit.' ltieanwhile in device M1., no connection i' is made between terminals wlien'lever V is operated from its N to its position.and`

cuentl7 returned from itsR to its n no ion selector J2. Lever V, upon beiugretx-irned from either position yL or R to position N,

causes code transmitter Clto supply coded Acurrent for operating selector J2 wheurontact 49 of a polarized relay K is closed.

Bela-y K is of a type in which the polar contacts, after being closed in a. given po l rition by energization ofthe relay in a given direction, continue closed, after cle-energization of the relay, until the ielav is energized in the opposite direction. lWhen lever V is operated to either the L or the R posi- 'y tion, relay K becomes vrenergized in the noryContact 35 mal direction, causing its contact i9 to be closed. Current for energizing relay K in the reverse direction,causing contact i9V to open, is controlled by a' selector J 4 which is operated by coced current supplied by a second code transmitter Code transmitter'vC2'supplies such coded current upon the de-energization of relay G when a train enters section A-B., Selector J4 is provided with a contact 9Vwhich is closed when, and only when, selector J4 is energized by coded current from transmitter C2. V I A sourceofcurrent, here shown as a batteryi'afnd designated bythe reference character Q1, is provided adjacent the location of lever' V. A second Vsource of current, also sho-wn as a battery, is designated vby the reference character Q2,and is located adjacent switch F.v Y u Havingthlis described, in general, the location and arrangemei'it'oi"the Vvarious parts` comprising my 'inveiitioii, I will now dc-` scribethe operation of the apparatus.

vAs shown inthe drawing, all parts are in f vtheirnormal condition, that is, lever V is in position N, contact 49 'of relay K is open,V

leachy of the signal arms S is"indicating cupied by liquid 11 continues in positions" stop, switch Fis inits normal position,

section A --YB'y is unoccupied, andV contact 9 ol each selector J is open. Section A-B being unoccupied, relay Grisv energized, a'ncl`-l1encc relay 'D is energized by its Vcircuit passing from battery Q2, throughl wiresV 4 andi,` contact '6 of relay G3windingof` relay l), and Wire 7 back tobattery Q2.

:Iwillnow assume that-with these parts thus .in AtheirV normal Condition, `the despatcher,desiring toicle'ar signal 'arm S1 for amove over switch F normal, operateslever V to position R; f The normal circuit for re-V lay K isthus closed, passing from battery Q1, through wire 12,`termin`al 13 of device M2, liquid 11, terminal 17, Wires 18 and 1.9,

the, normal winding of relayK, and wire 20 i, A a j Y Y A.bacl to battery Q1.v Relay Kthereuponcloses Lever V, through contacts'lf and 1i oi" dc-V y `rice M2, when operated toipos'itioulli. cause a code transmitter Clftosupply coded cur-fi Vil/hen leverVis oporatedto'its R position a circuit for `code'transinitter Cl'is closed,

VpassingV from battery Q1,`through wire 12,

terminal 13 of device M2, liquidr 11, terminal v 14,-wire 15, code transmitter C1, and wire 1G baclrto battery Q1'. Code transmitter Cl now supplies wires 21 and 22 with coded current `whichcausesiselector J1. to close its contact 9, completing the pick-up circuit foi-"relay `H1, passing from battery Q2, through wires 4 and 5, contact 23 .ofy relay G, wires 2li and 25,'contact 9 of selector J1, wire 26, Winding-- of relay H1, and wires 27 28,V 29, 30 and' 31 back to battery Q2. Relay H1, Yupon 'becom-V ing energized, completes, through its contact 37, its stick circuit passing from battery Q2.

through wires 4 and 5, contact 23 of relay G, Wire 2li, resistance unit 32, wires 83'a1id 34,

circuitfor code transmitter C1 from battery Q1, through. Wire l2, terminal insignia,

-code transmitter C1 is opened between, con-V tacts 1 3 and 14 of device M2, and hence transmitter C1. ceases to supply coded current for the operation of selector J1. Selector J1 then opens itsgcont-act 9 in the pick-up `circuit for Arelay H1 which, however, continues,energized by? its stick circuit just'tiaced.: Relay H1, uponbecoming energized, completes, at its contact 40, the operating circuit for arni .S1 passing from battery Q2, through Wires 4 and 5, contact 88-of relay G, Wire 39, contact40 of relay.H1', Wire 41, Contact 42 of switch F,. terminal 42?, the operating mechanism for` arm'S1, and-Wires 44, 27,28, 29, 30 and 31 back tol battery Q2. Arm S1vthen moves toits proceedl position. l Y

If the despatcher should desire to return arm S1 toits -stop"positionbefore the'ar-y rival 'of a train, .he Will'return lever -Vto its N position. Device M2 thereupon completes 45, liquid ll, terminal 46, Wires v47 and 48,

' terC1, and Wire 16 back-tobatteryQ Trans'- -mitter C1 now supplies Wires 21 and 22 with a Vcoded.cur-rent which operatesselector J2,

the same as that just Y a `train. over switch F normalv exceptl that,- upon the energization of relay H1,armS2 is Selector J 3 then closes itscontact 9, completlay H1 in the stick circuit forrelay H1,this

A.shunt path passing roniiwire, through Wire 51, and contact 9'of selectorJStoWire 3l. Relay H1', upon becoming shunted, opens,

opening its contact 40 in the circuit for arm.

S1 Which thereupon returns tion; n

If the despatchershould desire to send a train from location A to siding Z When switch F has been reversed, the operation is vdescribed for sending to its stop posi'- operatedto its proceed position by a circuit which includesthe circuit already traced for j arm. yS1 as fai-as contact'42, thence through the operating terminal 42", ivire `43,7 andmechanism of arm S2 to Wire 44.

I will now assume that, Withall parts again lin vtheir normal condition, the

again clears arm S1 for a move over 'switch F normal, and that a train passes location A,

despatcheif de-eiierffizinv rela G. Bela i. G. u ion bec c l cominor de-ene'rvized com letes the o erat' e b 2 p ing circuit for codetra-nsinitter C2 passing from battery Q2, through Wire 4, Contact 52 of relay G, Wire53, Contact 54 oit-relay D,

Wire 55, transmitter C2, and Wires 8O and 3l Vback to battery Q2. Transmitter C2 then suppliesfwires 2l`V and 22 with the coded current which operatesselector J4, causing selector Winding ofv relay H1,l and1 Wires passing.

inga shuntV path around the Winding of re# ythis 4circuit,

J1 toloseits Contact 9ran'd'complete thepreverse' energizing circuit 4forrelay K passing through-Wire 56, contactr9.

from battery Q1, offselector J2?, .Wire 57 ,the reversewinding of` relayrKr, and Wire 20 back; to battery' 1.

vUpon'tli'e lapseof a brief period of time,-v`

its. energizing.-circiiithaving been i D. openedby relay at `contact-6, opens its con- .tact.54, thus breakingth'e circuit fortransY kmitter C2 which then ceasesto-supply cur- 'SelectorfJ 'being then de-energized, opens its ,contact '9.inv thev circuit forrelay'K, but in Vrent to'wires 2l and-22.

the meantiinejconv tact :49 of relay K has been operatedto its reverse. position and is thus open and.'y con-` tinues o en las lonvas relay K remains deV energized;` LfRelay G, upon becoming ycle-energized also opens,xat its"contact23,the stick',- VRelay H1, then vbecome circuit for relay H1. ing: Vde-e'iiergized,.k opens, 'at its- Contact y40, the circuitfor' arm S1, causing 'arniS1'to return to its stopposition.v f

its il positioingthe circuitfor 'codetraiismit-` ter C1, Which" causes transmitter C1to supply positioni- Y, i

Assuming that the-neat operation of'lever l V'is to itsL position, the normal Winding'of relay :K then becomes. energized by a-jsecond` circuit, vWhich passes from; battery, 1 through Wire 58, terminal 590i Contact v-I-1f,no\v, the despatcherreturns lever V to' l l l90; -currentfor operating Vselector J 2,1 is openvv at h contact. 49 of. relay K, and hence transmitter' contact 490i relay; K, Wire 50, code transinit-r ope'izationoflever V to either "its L orl its'R device M1, liquid 11, terminal-V 62, Wires GSx-'and' I19, normal Winding of;` relay K and Wire 2o to' bacteryo.

Upon the opera-v code transmitter C1 becomes closed' passing 59 of `contact device M1, liquid` 11,`terminal 60, Wire 6l, transmitter C1, and Wire 16`=tobat tery Q1. Transmitter C1, When energized by supplies Wires'y 21and y22 With f`coded current which operatesselector J2. Se-

lectorJ2'thereupon closes its contact `9, com pletiiig the pick-up .circuit for relay l-Ppassfl as resistance unit 32, thence through Wire 65,v contact 66 ofrelay H1, Wire 67,and contact 68 to the Winding of relay H2;

' n n u .210:31 tion of lever V to its L position, acircuit for -from batter 1v'throue'h Wire 58, terminal Y 7 Y t) i VRelay H2, upon becoming energized, also Y closes its contact70, completing an operating circuit for arm S201 S* sitioii of switch F; It switcli E is normal,

according to the pov` passing from battery Q2, through-Wires l' and 5, contactBS of relay G, wires 39 and 69',

contact VTO otrelay H2, Wirel,` contact-72, terminal 72a,`tlie operating mechanism of arm S3, and wires Tel, 29, 30 and 3l back to battery Q2. It, on the other hand, switch F were reversed, the operating circuit for aim S4 would vbe completed, yfollowing the path i ust traced for the operating circuit for arm S3 as far as contact 72, thence to terminal 72b, wire '73, and the operating mechanism of arm S4 to wire 7l. lt a train should enter section A-B when any one of the signal arms S2733 and SJl is indicating proceed,V

the opeiation of the apparatus would be similar to that already described when a train enters sectionA--B while, arm S1 is indicating proceed.

com ianving drawing` itis clear tliatniv resent invention, while providing means for supplying current. of a givencode tor causing a signal -to indicate stop, also provides that such coded current shall be supplied' only when a track relay which enters into the control ot that signal has vcontinued energized while the sigiialwvas displaying a proceed ndication.- This avoids they unnecessary transmission of Vcoded current Jfor controlling the stop indication when'tlieV signal is already indicating stop, and thereby reduces Vthe number of busy periods oi' the line, and makes the line available a greater portion of the time for the sending of coded currents tor other purposes. c Although I have herein shown and de- 'scribed only one form of remote control apparatus embodying my invention, it is under-` stood that various changes and niodilications may be'niade therein within the scope of the appended claims without departing from the spiiit and scope ot my invention. Y

Having thusdescribed my invention, what l claim is: V

l. In coinbinatioma section of railway track, a. track circuit tor said s-,ction' including a track relay, a signal Ytor governing the movement ottraiiic into said section, a iirst selector responsive to rcurrent of a given code, a second selector responsive to current ot'a second giif'eii code, a manually operable deviceliaving a first and a second position, 'ncans controlled by said device iii said second position for supplying current of said.v

first code to said lirst selector, means controlled by said device in said iirst position for supplying current ot' said second code `to said second selector if said track relay has continued energized following an operation ot said tirst selector and until the return of said device to said first position, means for causing said signal toiindicate proceed when saidl nrst selector is operated, and means tor-cans` ingsaid signal to indicate stop when `said y second selector is operated. n

2. In combination, a section of railway track, a vtrack circuit for said section includhaving a normal anda reverse'positioii, a

polarized relayhaving a. contact which is closed while said polarized relay is energized in a given direction andgwhich continuesv closed until said polarized relay 1s energized in the opposite direction, means controlled by said4 lever 'for energizing said polarized'- rela-y in said given direction, means controlled by said track relay or energizingAV Y said polarized relay in said opposite direc- .From the foregoing description and the action, means controlled by said lever inV said reverse position for supplyingcurreiit lof said nrst code tov said iiist selector,4 means controlled by said lever said normal-pos'i-f tion tor supplying current otV said second codeito said second selector when said polarized relay contact closed, means controlled by said iii-st selector Jfor causing said signal to indicate uproceed, and means controlled by saidsecond selector for causing said signal toiiidicate stop.

manner by current of a given code and controlled in a second manner by current of a second code, a manually operable lever hav-j ing a normal and a reverse position, means controlled bysaid lever in said reverse position for supplying current of said irst code Ll. ln combination', a 'sectionof railway track.- a trathc governing device associatedv 'witli said'section and controlled in a given Vmanner by current of a given code andcontrolled" in a second manner by current of a second code, a manually*operable lever havving a normal and a reverse position, means controlled by Vsaid lever in said reverse posivtioii for supplying current of saidtirst code for controlling said device', a relay controlled. by said leve and by traliic conditions in said section, and means controlled by said lever in Y said normal position and by said relay for 3. Inl` combination,aJ section ot' railway j track, a traiiic governing device associated with said section and controlled in a given:

supplying current ot said second code for g controlling;` said device.

5. ln combination, a section of railway track, a ti'aiic governing device associated with said section and controlled in a given manner by current of a given code andncon- I trolled in a second manner by current of a second code, a inanually'operable lever having a trolling said device' .a polarized relay op-l" eratedbyV current supplied'inanorinal dir eotionbymeans controlled'by'said lever and opnormal 'and reverse position, means controlled by said lever in lsaid reverse position-.for supplying current of 'said'irst-fcode 'for' c o'n- `erated'by current suppliedin the'opposite direotion'by means coiitrolledfby"t-railc conditions yin .said section, and means Vcontrolled "by said leverin said normal position and b acontact o'frsaid polzvrizedre'lay closed in tlie .normal tlii'ectionfor supplying current of said second code i'or controlling said device.

6. v1n combination, a section o frailway track, a plurality ottraflic governing devices vassociated with said section', means for rselectively controllingsaidA devicesiii agiven manner by currents of variouscodes, means 'for 'collectively controlling. saidfdevic'es in a second manner by currentt of a givenc'ode, 'a

manually operable lever' 'liaving anormal 'position and a; pluralityof reverse positions,

means controlled by said lever'in said reverse positions :tor supplying currents ofsai'd various codes for controlling said devicesinsaid liir'strmanner, and means controlled'lby'said lever' in said `normal position'a'nd also cont'rolled by traliicconditions in: said section 'for supplying Acurrent ofsaid gi'yen'code for- Vcontrolling.said devices in said second maln- 'ner.` i

f 7. In combination, a section of 'rai'livay track, a plurality of signalsassoeiated vvi'th said section, a. plurality of relays for selectivelycontrolling said signals, a plurality 'of reiit of a-iespective code, agiven selectoryre'- 'sponsive to current of a givenco'ddcmeans for energizing eacliA 'of said rela-ysfby'on'e of said plurality of selectors respectively,means 'for cle-energizing each otfsaidrelays by' said given selector, a manually operable leye'rliav'- ing anormal position and a plurality of reverse positions, Ameans controlled by said lever in said reverse positions for supplying lcurrents of' said respect-ive 'codes 'ior controlling -said plurality of selectors, and means "controlled'by said lever in saidnornial'pos'itionaiid alsocontrolled'by traliic conditionsk in said'sectionfor supplying current` of ysaid 'given code for controlling s aid given selector. V18.3`In combination, a 'section fot railway track, a .track circuit for 'said section includ'- `treuen by eine ekieiay fop energizingsaia said section," a isignal' relaycontrolling said signal, a irstsele'ctor, a seeondfselectonla manually operablelever liavi'nga normal and alr'everse position," means "controlled by said 'lever 'in saidv reverse jposition` for energizing said lirst selector, meansl controlled 'by said' lever 'iii 4said n'oiinal position and 'alsoffconsecond selector, afpiek-.iipcireuit for said *signal relay ,controlled by said Ifirst selector, r's'ti'ck circuit 'for-'said signa-l relay 'controlled 'by the i; ndingfol said si in g a track`relay, a ksignal associated vvitli f said section,a lirstv, afs'econckand a third selector, means controlled by said-first selector vfor causing said signal to indicate-proceed,

'means controlled said second selector for causing said signal VVto indicateifstopna manually operable lever having a: normal anda revciseposition, a polarized relay controlled `init-s normal `direction by'said lever and in 'its reverse direction said `third selector -and having a contact' wliicli becomes closed iifliensaii'l' polarized iela'yisenergized in its normal direction and vvliicl'i' continues closed- A until said polarized 'relay is energized in its mean-s'` controlled bysaid" rev e rseV 'directid o Y lever in'Y its reverse position forenergizing said 'first' selector, fi'iieanscoiitrolled by said' lever in its iiofi'inalposition and'by said polary'ized 'relaycon'tact iforfeiiergizing said second selector, and' means' controlle'dvby said track relay for energizing saidthird ,selector.`

l0. In combinat-ioi'i With adevice capable of responding inla given manner to-a' 'suit'- fable "form energy and inf ai second given f manner to thev discontinuance `of'said energy, :means including electric currentv of' a given Code ,-forjcontrollingltlie application of said `energy `to said vdevice, mea-ns including elecine/ans'interrupts the supply oiys'aid energy-to s of energy tosaid deyice, and-means including said lever in its normal position and also d device, means including saidlevei'finits [rove'rs'eposition for controlling'current o i' 'said first code which controls the applicatimv track relay,pa nda shuiitpath around Y gnal relayfcontrolled .by said second selector. Q t Y 79111i combinatiomu'a, section ofhr'ailvvay Y track,fa -track circuit `for said section includ- '70 ies including a normally closed Contact of vsaid f polarii'iedfrelay 'for controlling current of l.said second code lorV discontinuing tli'e supply ofenlergy'to-saiddevicelY l1.` In, coiiibiiiatioir ivitli la movable' lever,

a device,` acod'e Atra'iisiiilitter'fordeliyering one code when said lever is movedto ,one

pcs'itionand another code Wliei'isa`id`-lever is ineyed'tola'diiierent position, means responsaid one code `for imposing one Vconditioiiupon `sai d' device,' means responsive to i said different code for imposing anotliercondition upon said device, and means effective when said device is in said one condition for preventing operationoffsaidcode:transmittere've'n though saidlever moved to 'said one position.

, 12. In combination with a movable lever, a device, a code transmitter for delivering one codevvhen said lever is moved to one position Vupon said device, means responsive to said different code for imposing another condition upon'said device, independent means for imposing sai'd one condition upon said device,

fand means effective ywhen saidl device is in -said one condition for preventing operation of said code transmitter inresponse to movement of said lever to saidlone position.

13. In combination Withy a movable lever, ai device, a code transmitter for delivering one code When said lever is moved to one posi- .tion and another code when saidv lever is moved to a different position, means responsive to said one code for imposing one condition upon said device, means responsive to said different code for imposing another condition upon said device, and means responsive to the actual condition of said device for at times n preventing the operation of said -code transmitter in response to movement of said lever to said one position.

14.'In combination with a movable lever, a device, a code transmitter for delivering one code when said lever is moved to one position and another code Whensaid lever is moved to a different position, means responsive to said one code for imposing one' condition upon said device, means responsive t0 said different code for imposing another condition upon said device, and means responsive to trafiic conditions adjacent said device for at times preventing operation of said code transmitter in response to movement of saidV lever to said one position.

15. In combination, a. manually controlled elemennmeans responsive to a lcertain operation of said element to transmit a code, a device, means responsive to such codefor imposing a certain condition upon said device, and means responsive to the condition of said device for at times preventing the delivery of such code in response to suoli certain operation of said element.

16. In combination with a movable'lever,

a device, a code transmitter for delivering one-code when said lever is moved to one position and another code' when said lever is moved to a different position, means responsive to said one code for imposing one condition upon said device, means responsive to saiddifferent code for imposing another conn Incombination with a movable lever, a trafiic governing device, a code transmitter forY deliveringone code when said lever is AYmoved to one position and another codevvlien said lever is moved ,to a different position, Y means responsive tosaidone code for impos- `ing one condition 'upon-said device,vmeans responsive to said different code for imposing anotherc'ondition upon said device, and

mechanism for at times modifying `the control of said code transmitter bv said lever.V

19. In combination with a movable lever,`

a traiiic governing device, a code transmitter for delivering a first code When said lever is moved to one position and a second code `when the lever is moved to-a-.different'position, means responsive to said first code for imposing one condition Vupon said device,`

means responsiveto said second code for imposing another condition upon saiddevice, Lmeans ,responsive to traflicconditions adjacent said device for yat-ti'mes ydelivering an indication code, andy meansresponsive to said indicationcode for modifying the coiitrol ofsaid code transmitterby said lever. Y

e 20. In combination Witli'a movable lever, -a traiiic governingdevicaa code transmitter for delivering a first code when said lever is moved toene position anda second code ,When the lever is moved to a dierent position, means'responsive to said first code for imposing one condition upon said device, means responsive to said second code for imposing another conditionfupon said device, means responsive to traiic conditions adjacent said device for at times delivering an indication code, and means responsive to said indication code for at timespreventing operation of said code transmitter upon a movement of said lever to said one position While permitting operation of such code transmit-- ter uponla movement of said lever tosaid ydierent position.

21. In combination'with a movable lever,

a traflic governing device, a vcode transmitter for delivering a first code When said lever is moved to one position and a second code when thelever is moved'to a diiferent position, means responsive. to said first code for limposing one condition upon said device, means responsive to said secondfcode for imposing another condition upon said device,

mechanism responsive to traffic conditions adjacent said device, and meansv controlled 'by said mechanism for at times preventing operation of said code Vtransmitter upon a movement of said lever to said one position While permitting operation of vsuch code,

transmitter upon a movement of said lever to said different position.`

22. In combination, a! movable lever, a detrol vc odesin said line circuit and controlled by Vsaid track relay for governing said signal, and means controlled by said track relay said line'circuit. i Y

IntestimonyvvhereofI affix my signature.

- PAUL PJSTOKER.

vice located at a point remote from said lever, a code transmitter for delivering-if` a code `in response to a certain operation of said lever, Y

to conditions adjacent said device, means con-fV trolled by said selector and said relayjfor operating said device, and a code transmitter controlled by said relay andl by said lever for operating said selector.

24. In combination with a line circuit, a

movable lever, a code transmitter controlled by said lever for delivering ra code to said line circuit, a selector responsive to the code thus supplied tothe line circuit, a relay refsponsive to conditions adjacent said selector,

a device controlled jointly by said selector and said relay, an indicator adjacent said f lfor attiines siipplyingan indication code to lever, and means controlled by said relay for i opera-ting said indicator over saidV line circuit.

25. In combination with a railway signal,

a relay responsive to conditions adjacent said signal, a movable lever, a code transmitter controlled by said lever and by said relay,

, and means controlled by said code ti'aiisinit- Y ter for operatingsa-id signal.

' 26. In combination With a inovable'lever, a railway signal, a. code transmitter for delivering one code when tlie lever is moved to a first position and-another code when the lever is moved to a second position, means responsive to said one code to cause the signal to.

give one indication, means responsive to said other code to permit the signal to givea different indication, and means responsive to traiiic conditions adjacent said 'signal for at times preventing operation of said code transmitter upon a. movement of said lever to one of said positions While ,permitting operation of the code transmitter upon a move- Vment oi' the lever to the other said position.

27. In combination with aline circuit, a lever, a selector responsive to an indication supplied to said line circuit, afirst code transmitter controlled jointly by said lever and i, said selector for delivering control codes to said line circuit, a section of railwayftrack," a track relay for said section, a-"signalfor said section, means responsive to said coniic 

